访问注册表 【_WIN32_WINNT_NT4】 （例）

#ifndef _WIN32_WINNT
#define _WIN32_WINNT _WIN32_WINNT_NT4
#endif

#include <stdio.h>
#include <tchar.h>
#include <windows.h>

int _tmain(int argc, _TCHAR* argv[])
{
	HKEY hKey;
	DWORD dwType, dwGetSize, dwSetSize;


	//  Set String KeyValue
	if (ERROR_SUCCESS == RegCreateKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, 0, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, 0, &hKey, 0))
	{
		TCHAR *pSetString = _T("Hello Registry");
		dwSetSize = _tcslen(pSetString) * sizeof(TCHAR);

		RegSetValueEx(hKey, _T("TestString"), 0, REG_SZ, (LPBYTE)pSetString, dwSetSize);

		RegCloseKey(hKey);
	}


	//  Get String KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_QUERY_VALUE, &hKey))
	{
		dwGetSize = dwSetSize + sizeof(TCHAR);
		TCHAR *pGetString = (TCHAR *)malloc(dwGetSize);

		RegQueryValueEx(hKey, _T("TestString"), 0, &dwType, (LPBYTE)pGetString, &dwGetSize);

		_tprintf(_T("TestString: %sn"), pGetString);
		free(pGetString);

		RegCloseKey(hKey);
	}


	//  Delete String KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_SET_VALUE, &hKey))
	{
		RegDeleteValue(hKey, _T("TestString"));

		RegCloseKey(hKey);
	}


	//  Set DWORD KeyValue
	if (ERROR_SUCCESS == RegCreateKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, 0, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, 0, &hKey, 0))
	{
		DWORD dwSetValue = 3;
		dwSetSize = sizeof(dwSetValue);

		RegSetValueEx(hKey, _T("TestDWORD"), 0, REG_DWORD, (LPBYTE)&dwSetValue, dwSetSize);

		RegCloseKey(hKey);
	}


	//  Get DWORD KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_QUERY_VALUE, &hKey))
	{
		DWORD dwGetValue;
		dwGetSize = sizeof(dwGetValue);

		RegQueryValueEx(hKey, _T("TestDWORD"), 0, &dwType, (LPBYTE)&dwGetValue, &dwGetSize);

		_tprintf(_T("TestDWORD: %dn"), dwGetValue);

		RegCloseKey(hKey);
	}


	//  Delete DWORD KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_SET_VALUE, &hKey))
	{
		RegDeleteValue(hKey, _T("TestDWORD"));

		RegCloseKey(hKey);
	}


	//  Set Binary KeyValue
	if (ERROR_SUCCESS == RegCreateKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, 0, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, 0, &hKey, 0))
	{
		TCHAR szSetBinary[32] = {_T('H'), _T('e'), _T('l'), _T('l'), _T('o'), _T(' '), _T('R'), _T('e'), _T('g'), _T('i'), _T('s'), _T('t'), _T('r'), _T('y'), _T('')};
		dwSetSize = 32 * sizeof(TCHAR);

		RegSetValueEx(hKey, _T("TestBinary"), 0, REG_BINARY, (LPBYTE)szSetBinary, dwSetSize);

		RegCloseKey(hKey);
	}


	//  Get Binary KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_QUERY_VALUE, &hKey))
	{
		TCHAR szGetBinary[32] = {0};
		dwGetSize = 32 * sizeof(TCHAR);

		RegQueryValueEx(hKey, _T("TestBinary"), 0, &dwType, (LPBYTE)szGetBinary, &dwGetSize);

		_tprintf(_T("TestBinary: %sn"), szGetBinary);

		RegCloseKey(hKey);
	}


	//  Delete Binary KeyValue
	if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"), 0, KEY_SET_VALUE, &hKey))
	{
		RegDeleteValue(hKey, _T("TestBinary"));

		RegCloseKey(hKey);
	}


	// Delete SubKey
	RegDeleteKey(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\TestSubKey\"));
	RegDeleteKey(HKEY_LOCAL_MACHINE, _T("SOFTWARE\TestKey\"));
 
	return 0;
}